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WordReference Random House Unabridged Dictionary of American English © 2024du•o•de•cil•lion (do̅o̅′ō di sil′yən, dyo̅o̅′-),USA pronunciation n., pl. -lions, (as after a numeral) -lion, adj. n. - Mathematicsa cardinal number represented in the U.S. by 1 followed by 39 zeros, and in Great Britain by 1 followed by 72 zeros.
adj. - Mathematicsamounting to one duodecillion in number.
- Latin duodec(im) twelve + -illion, as in million
- 1910–15
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